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diff --git a/Source/WebCore/dom/LoadableClassicScript.h b/Source/WebCore/dom/LoadableClassicScript.h
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+++ b/Source/WebCore/dom/LoadableClassicScript.h
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+/*
+ * Copyright (C) 2016 Apple, Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "CachedResourceClient.h"
+#include "CachedResourceHandle.h"
+#include "CachedScript.h"
+#include "LoadableScript.h"
+#include "LoadableScriptClient.h"
+#include <wtf/TypeCasts.h>
+
+namespace WebCore {
+
+// A CachedResourceHandle alone does not prevent the underlying CachedResource
+// from purging its data buffer. This class holds a client until this class is
+// destroyed in order to guarantee that the data buffer will not be purged.
+class LoadableClassicScript final : public LoadableScript, private CachedResourceClient {
+public:
+    virtual ~LoadableClassicScript();
+
+    static Ref<LoadableClassicScript> create(const String& nonce, const String& crossOriginMode, const String& charset, const AtomicString& initiatorName, bool isInUserAgentShadowTree);
+    bool isLoaded() const final;
+    std::optional<Error> error() const final;
+    bool wasCanceled() const final;
+
+    CachedScript& cachedScript() { return *m_cachedScript; }
+
+    bool isClassicScript() const final { return true; }
+    bool isModuleScript() const final { return false; }
+
+    void execute(ScriptElement&) final;
+
+    bool load(Document&, const URL&);
+
+private:
+    LoadableClassicScript(const String& nonce, const String& crossOriginMode, const String& charset, const AtomicString& initiatorName, bool isInUserAgentShadowTree)
+        : LoadableScript(nonce, crossOriginMode, charset, initiatorName, isInUserAgentShadowTree)
+    {
+    }
+
+    void notifyFinished(CachedResource&) final;
+
+    CachedResourceHandle<CachedScript> m_cachedScript { };
+    std::optional<Error> m_error { std::nullopt };
+};
+
+}
+
+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::LoadableClassicScript)
+    static bool isType(const WebCore::LoadableScript& script) { return script.isClassicScript(); }
+SPECIALIZE_TYPE_TRAITS_END()